EP 1835640 A3 20071031 - Optical receiver and optical reception method compatible with differential quadrature phase shift keying
Title (en)
Optical receiver and optical reception method compatible with differential quadrature phase shift keying
Title (de)
Zur Differenzphasenumtastung passender optischer Empfänger und optisches Empfangsverfahren
Title (fr)
Récepteur optique et procédé de réception optique compatible avec la modulation de phase différentielle décalée en quadrature
Publication
Application
Priority
- EP 05009496 A 20050429
- JP 2005023741 A 20050131
Abstract (en)
[origin: EP1686707A2] In an optical receiver according to the present invention, an input signal light subjected to the differential quadrature phase shift keying (DQPSK) is incident on a PANDA type fiber in a linearly polarized state by 45°, so that a delay time difference corresponding to one symbol is generated between orthogonal polarization components in the DQPSK signal light, and then, the signal light is branched by a half mirror into two, to be sent to first and second paths respectively, thereby giving, by a 1/4 wave plate disposed on one of the paths, a relative birefringent amount difference of À/2 between the lights propagated through the respective paths. Then, each of the lights propagated through the first and second paths is separated into two orthogonal polarization components by a polarization beam splitter, and the respective polarization components are received by a differential reception circuit so that in-phase components and quadrature components in the DQPSK signal are demodulated. Thus, a small sized and low cost optical receiver capable of stably demodulating the DQPSK signal is provided.
IPC 8 full level
G02F 2/00 (2006.01); H04B 10/135 (2006.01); H04B 10/148 (2006.01); H04B 10/25 (2013.01); H04B 10/40 (2013.01); H04B 10/50 (2013.01); H04B 10/516 (2013.01); H04B 10/548 (2013.01); H04B 10/60 (2013.01); H04B 10/61 (2013.01); H04B 10/67 (2013.01); H04B 10/69 (2013.01)
CPC (source: EP US)
H04B 10/532 (2013.01 - EP US); H04B 10/61 (2013.01 - EP US)
Citation (search report)
- [DA] US 2004081470 A1 20040429 - GRIFFIN ROBERT [GB]
- [DA] US 5295013 A 19940315 - ONO TAKASHI [JP]
- [A] US 2004208646 A1 20041021 - CHOUDHARY SEEMANT [US], et al
- [A] GB 2397452 A 20040721 - TOSHIBA RES EUROP LTD [GB]
Designated contracting state (EPC)
DE FR GB
DOCDB simple family (publication)
EP 1686707 A2 20060802; EP 1686707 A3 20060809; EP 1686707 B1 20090624; CN 100558015 C 20091104; CN 1815930 A 20060809; DE 602005015075 D1 20090806; DE 602005016157 D1 20091001; EP 1835640 A2 20070919; EP 1835640 A3 20071031; EP 1835640 B1 20090819; JP 2006211538 A 20060810; JP 4170298 B2 20081022; US 2006171718 A1 20060803; US 2010189437 A1 20100729; US 7529490 B2 20090505; US 7860394 B2 20101228
DOCDB simple family (application)
EP 05009496 A 20050429; CN 200510076093 A 20050531; DE 602005015075 T 20050429; DE 602005016157 T 20050429; EP 07012842 A 20050429; JP 2005023741 A 20050131; US 11742905 A 20050429; US 38262109 A 20090319